Supporting frame



FIG. 1 is a perspective view of a supporting frame showing the claimed design in an unfolded configuration;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is another perspective view showing the claimed design in the unfolded configuration for supporting an electronic device;

FIG. 9 is another perspective view showing the claimed design being in another unfolded configuration;

FIG. 10 is another perspective view showing the claimed design being in another unfolded configuration; and,

FIG. 11 is another perspective view showing the claimed design being in a folded configuration.

The broken lines are directed to environment and are for illustrative purpose only; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for a supporting frame, as shown and described. 